5-formyltetrahydrofolate
L(-)-5-Formol-5,6,7,8-tetrahidrofolic acid
Folinic acid

C20H23N7O7

Derived from tetrahydrofolate - a folate derivative bearing additional hydrogens on the pterin moiety that is an enzimatic cofactor.

Catabolism of proline, histidine, arginine, glutamate and glutamine (3D)
One carbon pool by folate (Kyoto University)